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Optimal throughput analysis of multiple channel access in cognitive radio networks

  • Queueing Theory and Network Applications
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Abstract

In this paper we consider a time slotted cognitive radio (CR) network with N wireless channels and M secondary users (SUs). We focus on a multiple channel access policy where each SU stochastically decides whether to access idle channels or not based on the given access probability (AP) that is adapted to the channel state information (CSI), if possible. The AP plays an important role in the random access policy because it can control the number of SUs who can access idle channels in a simple manner and hence alleviate packet collisions among SUs. We assume that each SU can access at most L idle channels simultaneously at a time slot whenever possible. We consider three cases—(a) all SUs have full CSI, (b) all SUs have no CSI, and (c) all SUs have partial CSI. We analyze the throughput of an arbitrary SU for the three cases, and rigorously derive a closed-form expression of the optimal AP values that maximize the throughput of an arbitrary SU for the three cases. From the analysis, we show the impact of multiple channel access and the acquisition of CSI on throughput performance.

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Acknowledgements

This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2017R1A2B4008581). This work was also supported by ‘The Cross-Ministry Giga KOREA Project’ grant funded by the Korea government(MSIT) (No.GK17P0400, Development of Mobile Edge Computing Platform Technology for URLLC Services), and by Brain Korea 21 project.

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Correspondence to Ganguk Hwang.

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Park, S., Hwang, G. & Choi, JK. Optimal throughput analysis of multiple channel access in cognitive radio networks. Ann Oper Res 277, 345–370 (2019). https://doi.org/10.1007/s10479-017-2648-3

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